Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91086e2f1c1d5d71a4cf29dfa572e3082708e5587ace3dafa250ab3c9a56ab7f' 
  AND token = '83z9h6zgrh/Y8KZO/Zy5Nr9N/wAQNc9P7aC8VpUQji0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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