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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ec9bee08532f312100abb3f13b19e75b59d01caccfa43a23e7e434656814a1b2' 
  AND token = 'traiWpE628dRmHZ79LnHpzMib0ZIBnOQZBkYrx6BJis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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