Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35a41a5876b6ec9dcd97136dd3226486a327a9d45b1d4630e0e867ae3ddf14c' 
  AND token = 'Oq1gxO76bZ0BPxrzoSxOUWR8QJoZe7SKB1vGKzIr/xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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