Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3417a4d5f0aa671791f48d14a7af7c210fdc767d69b914c5ce8b36566ffb145c' 
  AND token = 'lvgBa1F5Hd9EBkH2azjIPnLyvwPWJ7UC1TKdaKu8t+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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