Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ed6a5d7137959f146740f9dc7315f99abb8778b657664342628fc73e3473da' 
  AND token = '9pszEKbD35DfjPaSBCdv4OvMuaPyQ7wsQt4M6On5nXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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