Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a344c785dff53659734b168be7c8856424b773bffe036b8a50d2337257a1d79' 
  AND token = '17lauegTBnim4h9Vso8gmFxAeaQPX1BGBYT9SaLJJO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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