Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73a45b3babb9cf6993623a9f59b802e6a96a6f50489f6a2ced231eeeba6e676' 
  AND token = 'uX9dM1XCrKHd7KfwPIryiPLd4OYknrJHnlwbGcU+RGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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