Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8eb0eecb0a81ebf4811fc84ab769ba020b3b4dc9f7204d7e3f36626ca479c3b' 
  AND token = '12/Q9lJT85pQB9VvXc9+8/jbH5VAHWEhOe0yU9YUPSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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