Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e639e631c3d9d87f9ebf91abddbc4e3daedb17a15060971995c7a1d0e55c4c89' 
  AND token = 'U4JBCJRPJm2zj1mOdTVpAzIYkZIHt/NSsyh9G9XUSlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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