Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b786b5ef8c0ff6ae47f82cf36ea72cd221cfb82f9e750cbd62539c54f1cfd54d' 
  AND token = 'AcU0xIgD4S11C6tVE5nYf2N9pJshTwZ7OTUnnRXTqu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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