SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4bc7442e9ea5486f7086f8c49d86de23c3cac5f640f6b6f7f646db94bcd0ae3c' 
  AND token = '4osNhxl7rgmj15lHRSpKA7wlmp3Gq5G4zWGgivp0o2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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