Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5d9934b741ceed9446fb8493dacfa275755fb032eb94790e258660b6a7da71' 
  AND token = 'p4TQkaezXsq8f9re5rGmlGyGFVZ0UejP16ip2oPixUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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