Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ed0ce678a96c3f0ab9ceb232fdb46d156a873d2659567cd978c45871e509ea' 
  AND token = 'Q0P+45tuU9ucRzFtKGKRt+M6uGw0FNa8kaf0z1wgBfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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