Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b50ea621e2da6104ca96617d5e7caadb108c3df4189595886d2865d75d80fe' 
  AND token = 't7hwNDz7lNpVaBTQgUYIjPcb3uAGDcoMsgGbJYwuQ0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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