Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf14924e585f34b861d7fd8953fd3b4ef18747a65ffd06543aa594293ef2d67' 
  AND token = 'jenRc9nPAyo84JMHN/M7ZwwkiuQUcRjTyMZ/oPGfTBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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