Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df01660a4b9fe33f4fb0bc330e47a91f5f03cd687bfb507fc749e0f561bb9acb' 
  AND token = 'DHnq2g3qsySCtdmbIn8wEuphnjCWxyk0RfQvQrD73Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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