Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d3e73452f24c580303629d9fddf36e2a9ed20bae182b250a29b8169ade8e15' 
  AND token = '+qKuHCqEi/iHQu0ylgSD6PQUZkHylYDiTypKf2mOsGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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