SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '719cfffe4eb172b51d5b29fc6554bc2d1d1f613742ef4cdaafb198b339d7a186' 
  AND token = 'pTHS9bkiP+u7eG/vuhzelWsZpZZrFw8CIw6GMTGuq4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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