Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d7ca0ff0544a771c45443d30c5e3736d844b90f7d844f12e7cbe1bc0a88261' 
  AND token = '3MRvhEg+AeV7RwsTnPllFybWhq0/g9uoRHEnYd2oN30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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