Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3b97ac43e9c491a07b43db230fd5712ca9e36b9681cc070e4ed9be9dd40b63' 
  AND token = 'X9/lqk6GekJm+YHJdShqMZh76kdPbN9THVFHkVLMgeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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