Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7cbaa5f7f9bfb1afdce32b1e7cceeee43df024baeaf07527778c7630b64ad8' 
  AND token = 'UBPjol4dkWdLAjp5nv7yk85aN7ZQ/+4pGYDiJTzsel4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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