Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f4f6ef40397178c2d5327e77514b577fa2023780f1fa24f11e6b4a5686ccf2' 
  AND token = 'SvN9RFKkI5ya+qoshKkFcy3QwVW2KFWz3NeCZR0Wvbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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