Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f350b2a85762ef34acd80612042bddbecc519a57a704b98c2b7d1d6bade8f322' 
  AND token = 'd7+jFo3AzTvlOeA8yqW3Ce4MYojDCx3s6NxPFpnB+FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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