Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad04b034a4cba6f614222fd4284e6a9b0d6c895ffacc43cccbd0f96de6ab6a8' 
  AND token = '7MVSkCtFoFRbFl5cIu+7TTzObSfQ5rm4rsKZpDxXsmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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