Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98f988c7361d1ed96f1d5dba4bdb52f47729adbc3bde8b4ea8dc2372c25a837' 
  AND token = 'bnLrwrAJc0knZRxHMhwUxjMYgNgagbZ383PZBT0sTKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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