Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3570435d82e8ce50ba7a04c29b6895108deece11510c4b55bc7635251f20f4' 
  AND token = 'PB/5lEVupOcx3Ya9kYw5JLwhQs5+nzPH1Te4dCVos4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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