Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b4154f388fc8ddb5be5637a49e7b05f4846d35c5c9c59ee42dae499d5ec86e' 
  AND token = 'iPaF8eGA/UBRNIk7yLyK18AsnJ3pM57/DZn3BdURR/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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