Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b797be9f0a37dfeee3b8a33b9bcbb36c8ecbe83a8d284b54a068a95fb54586a8' 
  AND token = 'UVIay4weya+1vX4cXdZeLgF10T2Az4IBxULTe/UahLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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