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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5977b9c2451fff234446e20c9ed9057d46144f7cc6df92e61758fc9816b87b31' 
  AND token = 'EzbFIq1qxiEOPM2xtOnkRnVGFOe02dAxlbCLTk8FFak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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