Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f70de144a6444f8657df5f927486e18cb96ec7fd436adf4009a3005b407998' 
  AND token = '7N+86fPmWJgEa2OSyyZjYmf9Al0SQxWqwyUMrge8WAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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