Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a283fa355f5fe3df9939013dccfe6c4bf8ae5381cb4e21d777ca7827aa40c3fe' 
  AND token = 'sy5tCjFogHAOemAp3Rn7TGBuPZvcOVYh8xnwLsSSu7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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