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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '270de64d20d0d8a2b2a9f2c824d11b799729bb8c5446715f8f40578c0a6c4ae2' 
  AND token = 'z+zshZC2dbedjo2lRf3W9+7B4FPuAEQkU89u/OA8JX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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