Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b030be6adec6f3fdee248c1af44771a013bc461e5b8a7f09b3c4733746f44b' 
  AND token = 'LEaeXGPowl4HSBLOIqi+ilKgMKUmsZR4HGOA6QO1re8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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