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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e405c56f4e5068922be8cc5c03d54edda2fd20c19a2ec73b3622d8276976634' 
  AND token = 'ysduFgoykBfLjGWiBZ2IOEQVkXx4VZSRxCQA73tBYZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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