Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46647e6e12d9f60fc4372bbca4ba53556081531715f6ac47c62ec77fa2518852' 
  AND token = 'aiNlUTujK0ChMkI0PhZq6RT7yJ9th2nNIdHXVuaUgmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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