Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574dc268b28b5cc2c953e1c0cc5c84e2a93f088df7e18579bab37ff417439dfd' 
  AND token = 'c/5jEJk2+uLjWN4gwK7RhJcC/ZX/+a06e/dxcUxCM4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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