Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fb7c7264ff291e559cfa5c0c921fd7807e4efb69b9bb3dedd2558a05b6eac4' 
  AND token = 'LHyi3sp7GTFGI0+n7/9wFU4gtMiAd1VXiunPCDlqzoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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