//works
  $query = db_select('member')
    ->fields('member')
    ->condition('member_status_id', '1', 'LIKE')
    ->condition('membership_expiry', time(), '<');

//works
  $query = db_select('member')
    ->fields('member')
    ->condition('membership_expiry', time(), '<');

//doesn't
  $query = db_select('member')
    ->fields('member')
    ->condition('member_status_id', '1')
    ->condition('membership_expiry', time(), '<');

/*
SELECT member.*
FROM
{member} member
WHERE  (member_status_id = :db_condition_placeholder_0) AND (membership_expiry < :db_condition_placeholder_1)
*/