Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2b0370ab40e54f8d0160e2f6ef4ca3ff7a5e35ecd4a7c3bee6b2edfef91ea25f' 
  AND token = 'd2MG/qqCT7GGrCtdXRQrmMchx1uSnKWQUDZCo5oSTGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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