Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e37a23e9ae83ec69c9c7a66ec3c5802c29819a075151e2fd2a10b0a268178e5' 
  AND token = '6oPUrn+ZRsgnsN/8mn0/E5skZCClNrrJZP6xnO+zK/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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