Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c14a62e74f5cd7f9b730f65a62fc7e2debd41a457ed0fdcfcbeb5808ccb38e' 
  AND token = 'sLIfjN2yqnQ8yt/VPKjd9A50RsIcbwc2dJrguQjXNZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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