Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf1fc5b1b6892112465b15061b98147eccc34480aa2b727e72a29b174251c84' 
  AND token = 'eDgcdVxr5deQuSepbMtHK5fMHtw/J8y3NHujZ5SMxvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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