Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e91d2894a27a518e548cd3704b6102e8c79bd5c6fd83591ecf0f9fe4376314' 
  AND token = 'lNF7jTZ5QQXkl4n1OL7L/AL/EkbQJv+w/j5Doni1rfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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