Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0d2f1f570250e9169fbe6ac14a7eb02b7f0f2d2bf2483bd9639d8b77cd3362' 
  AND token = 'Qt/qWp634IWn5tbGi/6leECHsPltzWs35ZCIxzoAzvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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