Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b99111db690ca59516003c82e884264434ba54b93344695b6f60fcaafc604ff' 
  AND token = '8nbMejEUyPZ5hWGvqddRMSRU9h2a9v49Huw1q/ARj/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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