Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db89fcd6f9d56c42d7c9487f581fc2db72c8fa2ac8a461b607680b2b56e96e3' 
  AND token = '3CiRG98cBgiPW+BdeHEX8eaClf5wKXEmIKoZKNlciS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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