Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b68cea946b63a99f559e7cace68673db894a5a728cfbbbc2c9a9d02449d209' 
  AND token = '29HXfGwaQY6ZTW25yicaYmvc1fNreV96jsZfHW4u0mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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