Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d2c8a802d4950a190bebff4e2e57c0defc4e50fdb03a5baa0371ae5b9b9acb3' 
  AND token = '2BKPwfzXEr/bjBzsBB+ZZGsA5NI9Ht8VwLjl0a+9d88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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