Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b285a228359b94a5cfc7716bb6283b720c660f931083c84fecafa121ed36041' 
  AND token = '7YHmxUe+tNAqEBRDs7scKn2ZTI4208gZ3lpMdrDAwUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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