Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bd34391f75fc237bd092ea5e9125fbdcf67f1a60ebf3557b58e3f7fb6c49dc' 
  AND token = 'SZmwkvReraBeWMzziCgxnAA7dj5tJiyhp7+ti730bNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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