SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72e504b40c856a6511884bfd92fef4201307079c81b8ea24edf30f3eee7f7696' 
  AND token = 'MNgaxcj0qj3kPYzj+HiCIcTBoGYbEZ8H8K2Cd2gsf9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}