Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670d68b59d5b2251fe63753e9e538ababe34f8e766f4df494ddf54e54c9fc470' 
  AND token = 'pvreBAYtlyHJEAqL4EME7UkWjKaBZxEOrXsSksLLiKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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