Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0698fa3b6c3d72dcb33df2e2b4ecacde15b47ab11c5c93f5f761199ed27f333' 
  AND token = 'oQrfEQ7Hqk5QsDVB9qX0RGV/zqadxAapAqm/dsoZcbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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