Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45137d26b60b15f8d18ab9d2b6d17a8efa8ca12622969a6ed3772102c338afe9' 
  AND token = '8XP2RwJEzOarfe2Fvyi+0+CF7QZ1Xbe9EGPaEOnf+lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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