Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8263301d703995d44c51f989f5dcada141ea1551edcdaf2cb7411c4f74396495' 
  AND token = '4aZSLfCYokLIGUC/7SxA9oGDhjX4gDffrUy/AkKnlXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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