Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fcc5b3dd9698409810b1d3ab07666981b3464a0fdb74473fc0e6535ecf638f' 
  AND token = 'vzibL68mamUMHY4zd5Sl85JeI6tHJ5G0hr0RIBsHS8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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