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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ecad43e90bf0562f4984aa64675eae5fb9992683f8d485aa8e5540fdd9ccb427' 
  AND token = '1JH3R0qFbtn09rEZ+2cRtTX5/JVvyOCNHdm83pEXo/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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