Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9add6fe38235c799e49bb3886ab9241a971e0f681079383dc3619323d8569a57' 
  AND token = '4vdbeqbkGwUDW9AWTkuPhkBv2XwCPmxWI1GWvC7XAdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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