Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe0d0d903c6357eda4a3bec9b9052c9a2e26f79968d9fd38eafaefc9c7a1487' 
  AND token = 'uhjcOcwmTf+A9Obmol94a1BAmQGu6kjwJbVl+JMDjkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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