Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4536bd5ba436310ea6838c647c6c9987093c5e13eb1a69dd33ba30b47dcece2d' 
  AND token = '6u/mufCXOdKpGH4UnoGO7B2HaZwIJ+DAQC6uTAkoxHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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