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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e3cc0f7b26abda50f1bdf48176e32a3263d9219b1d960e7c11998a29a4cc0a6' 
  AND token = 'YnuxXpFHUi9VtOstzMVJ8ncBMh+irp3gLwlBtSu3tNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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