Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd067c131edd98355f5e0e2bccd4dd8b11444b10709c9fd66502dca40461c691e' 
  AND token = 'Gxq/y9a+nhTwGydis5CAVbmifl0LaB3ndIKX6lcAXDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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