Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4561fab829769dbcfb4cce3f3335da86e27a24bb39605fd6e989f8fc9a07c451' 
  AND token = 'cGQcTSXIjyH3Jzp8EQSSGzBy/DGrXSwl5WyeqaZsHTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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