SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8047804591f62816c3fd57b042008ba4827af9de0288ebfea5944d1767dbd74d' 
  AND token = 'Fm0JiOVbtBnFjUSnQntxSXNGmRUvYursB1T9dt+GL3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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