Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8520644f80d333b6eb4b495fc108484a380e9bfef053f712682b99ebfb857f95' 
  AND token = '8+88VF8uRtxiJMEY+pIzwE8///dV+vAYW+VKyb/iMEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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