Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67436c839dd71f3fd526b6c44663abcd247be3e8072e5fdd6a3b704e6c5ea7c1' 
  AND token = 'g938pbAZRjZgZVcUJ1IVGBsn3mVmC4td+COYBn0S4EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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