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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4f6832e926f35bfbfc408e1c2865c705dd0830622f02591a21856f60d7aca74' 
  AND token = '4UFVre8dVmGug32H9FYHtPo5nl1FX+mrSIb9ACPWPGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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