Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9bcbecc4233964b7bd91e2589c28d7e4e3985dbe477aa04f8f5f77b2cbe1a3' 
  AND token = 'M/y6/ORLoXoxxHM1lzxJTPhMMfQZbw1cH7c0G/iAnU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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