Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543b7bdf68699f66099eca6faf30f26eb14fe8f1b838ffb079a7ecee0f7faa78' 
  AND token = 'xqJbstKB/NmBopex2gOI6gtj7WydWRmeCBuV+9C5JQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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