Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2d3ab01be27d185d795c3ce599deb26a667d29f43bf54c16af3faa22b5d718' 
  AND token = 'EIysx7bJjD+mjqItnrAIosJAmoAvhWxSuXQt0h1VEQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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