Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '42bdd50a39751bea3a3389ad273ef3b07f3b8ecc45c0031f7e5e9cd56c3e52ae' 
  AND token = 'aNTmSZViLe7POhfFNzk0umSb6uFGYbqHEHB+0Ki20oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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