Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ad839facd606600052727c51369221373f9bfab129222d26bae32803a14f74' 
  AND token = '/FwrhOxvA8e5BfRoKJcIkNScnGNrYcs09hXs09pv9k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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