Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7413178f8bafd3912f9b3f87702b388cd8ee7dbe026a25614ad24ee48f8bf4' 
  AND token = 'uavLhiDfj02RAb3zU3D5DsAJjBg3a4MGT4FWDWTSv9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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