Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d05fdf27cec37f603c3c4167185667e2bd114556116c23a1eb2f5c273dda3b7' 
  AND token = 'UNGz5Pnbu7Qjd1jHA7wIcbobifxyqGmjYQlXZDm5XYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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