Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02dcd2c42d86344ce1b280a28c40a9ab8eafc1b9e2223826f37e3dc2c9199ca1' 
  AND token = 'shXU9fV5IIRc8rMzNovmzKcMlP1Ywvz9ldG+l0DE3nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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