Index On Oracle 11g - Get Results Faster?

i have table (MEN) with 900,000 records.in this table i have field `IP` and `Tdate`.when i run query:

select * from MEN where IP = '1.1.1.1' and Tdate = TO_DATE('07/04/2010', 'DD/MM/YYYY')

it takes long time until i get Result.i try to make index like this:
create index
my_in
on
MEN (IP,Tdate );

but how to run the query to get fast Result?i try this:

select My_in from MEN where IP = '1.1.1.1' and Tdate = TO_DATE('07/04/2010', 'DD/MM/YYYY')

and get error: `ORA-00904`