Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef7454b84cf228a33755ed02fd644cd8934723c9eff6cddfe67ea3fc4b94f61' 
  AND token = 'HZAiieKqc4cGORqllGr7crc+yugQ9KzFNVordUGBwvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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