Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7e2b2ab83d1b466ed4c7c4891937bc10a5c46d9435c8223b99389c62888306d' 
  AND token = 'ACGtdoZB8SSrM07N/V3N3wEqb+zHumPQ46yg+urAGec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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