Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df210364f9e8e8c9a2205707a253032d99efdb061ee0fe5129261386d67fd399' 
  AND token = '63zxZvh+YrZIoPW6WY/mjcetHSx37RyebLUA9XgUd9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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