Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee90e8195f8cef5b295cacd5961b11da07f9448b4d741c8b15badb7cb1483ba' 
  AND token = 'PSgdDp2HJG7Fizu74tosz3wqwaLdaKQ+ITeT4/zQpz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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