Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429de5f5415e1689a13f86a3f741324d5253389b8d42689563a4536801e294af' 
  AND token = '4LBavi/WTbyVgU1oOu3P0hvdtUdxcTDcN/8FNMXLknI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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