Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28349c37d6b3ca9ca1b8b8593723163ccdcd8e75428f5022aa7c37423012dc4f' 
  AND token = '2nXmC9BWZh7xdQrnxpFZPzlo6+aoa34u+plKLzrME0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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