Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621b446448f709d1fdac43a1a31745934ced580838396cd2f8ed3159981c061c' 
  AND token = 'NnsKuGXRNnzKfDClGhpl/Oc9+t3zab+W+3Y+YCP+yb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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