SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9b12299890ce893e9384304051df8f53d56e87589e5dbb2b8ad80fafcbbf3b97' 
  AND token = '6KfhhB1S9I/ORKLHIt5IvaXj0j7/1zP/ymw79oa8HgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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