Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e5780ec01d17580266c40ca5f3058f220b609d144da8c5c52362aeb174bf55' 
  AND token = 'jNYaj8YWfuLAMZIht6ZJsprSZCvniO3H26Uffb3GXoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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