Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b5e5feb128c231b83b93cd41bf2ca57399a51b8939b0c21933b72a7b90cc20' 
  AND token = '4pMNToDe/5cUyaDmbTKMeI+saY177MxOdNK+Z9/CkNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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