Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b03d1fdc9f42eeb4244ff46adc6eaa92e6bd88891016946c1d32af0712c087' 
  AND token = '6Njg15+3LcX5YSnyAncaFRaxrXc8t62ULdcUcWwV7BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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