Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476d036c7c45aed86febff27dc8adcb213929afe84734115ba4b87ec635cd04d' 
  AND token = 'dT856TlOZDwNhiT7BvnV7M55RWhTOSWn5Oets4te4uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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