Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc3806878dfc236c854fdcaf7d7a3652db7490481a5b53df7ac9e7b1c8a91fd' 
  AND token = 'xNt8Pwe0zkYELOUhyR1OqSm8Mve6Lrrjzf3X6+8LJX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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