Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57de28effe4594ee936f9ae4a6e1fc304fc413220fd05f29df3b3f9f549e4f3f' 
  AND token = 'toMeRdBUUk//pad5kAwCkqPkMYR62OFXYSSccNnmqj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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