Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ef7bcb76956ac5ce92fc6176dd0d3ab8f74720e885fdfba6e6eb5f4ddb2e85' 
  AND token = 'jkvL+KbsAhGx6wV+xEUYUxRdPKVB28rAu2fln5EwF4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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