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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d9899ee88d8d1d91c388884800a57b98257d883ea776cd527c5f615b725f9f4' 
  AND token = 'nVp4Xw3cUld+sSwq3yW6mWTjcApuLXbm250lnWAo0NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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