Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a674e73c35694d309be95b4ee035bc57b49045ab3f3d33491dc26fa7c5e40ab2' 
  AND token = 'VPswOPzW5H1pxWlZqi//0f8ld8VtJB+ag54eoF8+qdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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