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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d1d96c88766f2d27763471b70d09b712927dae25fe84461a3e6459f9209cba1' 
  AND token = 'yiIO26T2OaqiTJTOYsja5csBZvv81t68uRO6GfTQA2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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