Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '863ded95485ebf89e88e996549001aacb5718557577ec73389e0f3c8e3ba2ee1' 
  AND token = '0IczoixYudWbI3Z5KoIPVXpMEgXbPiYL0fsjoh//SGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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