Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f7be03b03ee2b435d9c9f54ce0aa8d600ba820590606defdd6fda8e02a8ff0' 
  AND token = 'idSOFCyuK9XpCjniSqg+0HfPGjE69hZJ7DEwS3fTgLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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