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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e52920036f7daf9a9f62adb66f050db758d928d454ac9ccfb1915bbe4be7740' 
  AND token = 'WDJH7z720gIn3BUwbClN+UTEbstxvU7EAOgPECNPgzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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