Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deceff17d533c7d3553326117ee46ae672e0f6b224ff5eb5f46e75c80094aae7' 
  AND token = '6u/mraqv5lGyUyyH7PsjuaXaHyziXTdyogBBYade7Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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