Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9bd2a48fb90c8bf78a92ec9846c8d66ec178ea6cbe44e3b15fae8b85aaf2d6' 
  AND token = 'WK6gKfldlz3fyFaIIB//3XGUg6RVj273akVilmBMhR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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