Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5a323559a63f141a2e19fbb88f9eba13de30487282b38a79a4593e2fe35f1e' 
  AND token = 'QTtTQ96e3Ufxc+s8R9j/9i9KNthNlqabLDNP7pANXCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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