Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c0d20ff284bb55e5fe714dd7a8a797aa32d9d9745105693ce4680720f75e6a' 
  AND token = 'UAQrcWVyXhEd+U/0/XTTgOE2tU0jR7E50aBQirlq3pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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