Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4485092ce16eb3764f13755f2a7d657dce04ed0fa367e14f576078d0dd366010' 
  AND token = 'DSO2TIn3arZR5oI/Xw1EZ5JhS2UjlXHdhQYx2D7lWr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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