Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dd2a70ad042ea68ac456f552be6833388134f9a8f9f0be87e9fef89523081e' 
  AND token = 'x2+hb1IaQnZK6m56ePG7bwGaVJLuxC2JIgxtUqX0cb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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