Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f309245352dc7adb9b360f8c6c651f7cc9a5fe808c1fe5c812ef7fd0acdeff' 
  AND token = 'RwFTY3NtVv7SWG6GFRbKd7zlWsfYyIUFPlKGvkZL1Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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