Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786c8d910b3e3116b83666414fb816c9bfc4f2babed84f4cf95a3bb17f4aa4f3' 
  AND token = 'zgQbDDWqQIZxrYqPCHoTypTc3esQWONfbGMC/oqfOS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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