Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d96fa8ef7a4c8fbec5b7ea5df0d183b41fd2702954e2f12ffb4e57d1bc49d54' 
  AND token = 'ukwGZw4y+/pTRWc48Km6nSeD1lefEouqFB5ZgiWSuZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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