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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cc2c5f6df52dcf464ab4766049c38daf06674a18757ce91159ffc9b535ed9c65' 
  AND token = '57/dPKTVZqwtMDhSUbusIzVx6qWO4dJA32SCpEAWnJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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