selecting a max within a max oracle query.

Using oracle 8.
I am using the following query in an oracle function but I want to know if it could be written better. I have a table "my table" which has two sequence numbers "sequence_no" and "seq_no." I want to find the maximum "sequence_no" for a particular key "my_key". But when I find this max sequence_no, I have to find the maximum seq_no within that maximum sequence_no. HOpe I didn't confuse you. Help and Thanks

SELECT decode(my_value,'Y','Fuel')
                  INTO ls_temp
                  FROM  my_table
                  WHERE
                        util_name = 'h$_fuel'
                        AND my_value = 'Y'
                        AND key = my_key
                        AND sequence_no =
                              (SELECT max(sequence_no)
                               FROM my_table
                               WHERE util_name = 'h$_fuel' AND key = my_key
                               )
                        AND seq_no =
                              (SELECT max(seq_no)
                              FROM my_table
                              WHERE util_name = 'h$_fuel' AND key = my_key
                              AND sequence_no =
                                    (SELECT max(sequence_no)
                                          FROM my_table
                                          WHERE util_name = 'h$_fuel' AND key = my_key
                                    )
                              );