Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ef647f3e7d6b0e9fba0801d9f1c888ad23eaa72e94cf969d8fdec2747e10e3' 
  AND token = 'c0Zv6qMJdQnRrPMa9QT5cZH18TnSQU+7gM/Cd5L/6fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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