Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd042a58b82d17e760ca57faf54943c2a578cbf80ca99d274029c26b5ad75545f' 
  AND token = '26TXfQbMAPnmm+Z+jI80cxgxkV2GT3qUGX9cD+FgwMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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