Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb51b653eb3184965a7c39ead0a5f34a24f5f31bcc38e8dce20c04372d41a08' 
  AND token = 'YW/oa/NoLedjQczPCagddZZnrMZO0IS66Fs4OJZcP38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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