SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f69d267984e313bf4cd101a1740c23ef642158394d20ecc28c6f8b6401e0042a' 
  AND token = 'tkPQ8ESs5epQJSBhnvngqBR6LjBaptJPVrOvvAFut7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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