Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb0b3c9de1e9f83a3ab1d1b5dd6bb263d1d03665eb1537c49e0066915b2b7fd' 
  AND token = 'PeGal+0Zx7qtPQik5AiUl1KynwmdBDIeSB0IrXsid6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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