Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b6d12d21a0f19d82bf6200d244f56f6cbeaac99fa302b39ce93565f383bb42' 
  AND token = '4FF3OlpI4E749bBCyRUYfSxQd9MJBaLfaODaKfHQg8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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