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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '975520cac4a6e625f4f103985427400c79f38da5bb56a14c30c73fadc8edc3b5' 
  AND token = 'mMSGDL12PasCs6snYWFJ2Mhchf5I02zH3emliqwvm4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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