Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d6bae19cb942d4b21dfefaf17410ad6105182dd8c6a7d7554bccfbee2b04cde' 
  AND token = '7hY3czqAOsuhCfUqevDZD0a44ObRV/0/wj8mlcyn/Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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