Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e7cf3a3e52ba4ec6803f7f8b3295e064c5638161d2975a700c38cce6ee56a1' 
  AND token = 'QBM9NpUsPPy/+6zubOQtkhgZkK6qTDKHA2QQyDiJFtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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