Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb9ad82cf2e8babacd27c8912d01024c600d7bcee965b5c6e1a3d384da52f0a' 
  AND token = 'bWzj9kAs+prhK1KIbUHOTqCk+EeuUbwmHFIXQmHYS+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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