Can't understand results of pg_stat_statements view
I quote the manual (at the page you are linking to, just for the appropriate  version 9.1)


  total_time ... Total time spent in the statement, in seconds


67347 calls totaling 0.852 seconds. That's 0.012 ms per call.
Not uncommon for a simple SELECT.

If that cannot explain it, consider this quote from the manual:


  Note that statements are considered the same if they have the same
  text, regardless of the values of any out-of-line parameters used in
  the statement. Using out-of-line parameters will help to group
  statements together and may make the statistics more useful.


We'd have to study your exact statement(s) to assess that.

There is also the function pg_stat_statements_reset() to reset statistics (superusers only). Are you sure it wasn't called?

And there are a number of configuration parameters to regulate what is tracked. Any fancy settings there?