Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '287500dbc719683325a0ea28bf101d2e7aeed696619a8f3ce0109acc7ea96f00' 
  AND token = '+ztVtiVUdcSXPgjN7Ky6VveK5jKMz1EWZoxwHl4m6jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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