Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a7a0d712861953c965e5a615c8f8794fd5b9fc4099ec34cb141545d94d6ff7' 
  AND token = 'MeiysI1u601GNC/fqKhEh+XXFbbrXXmxP3RLCXzM2Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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