Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3212552d47301d35b82c04ec5c185757c3335a5a28b7d8a4e51232b8aaabb9' 
  AND token = '4rlBaaHSUe58OrroLTp2prd7k0NXCVm2twut4YLZ5ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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