Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce15b56635ca9e6ad54e07753a43708e8c41f0fd4eabfb3c8b331c04c34c76a' 
  AND token = 'uppW4D/PW83xBg5ruiJiKBF4moDUIk8xsIxwVcm7CkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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