Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad4062ce6e59e84a8c62f077e047cd3e0a90d095d73c7e9dd358c2f3d55b6d2' 
  AND token = 'Ae+e52owcs/dtZEkbCvynHsZ3w0yiAoQOazxpR3SqLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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