Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a47cf7a7129129012c67d338fc6603f8bedaf4929f3ddd2f4b57e49d964fc1' 
  AND token = 'LHPL8/gHuKAID68W8VkC187soZbDhKslRe8r6lT6QG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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