Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1959237051a1cf3b23c5869f3c7242c733e8c8c16737c32596ebd7d56dfffcf3' 
  AND token = 'vnIfEb/ECqCGdRzuIg6pXdpcrm3GgYe8Yu+nu/qmebI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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