Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5373cfb39de2a2bef3f8cf6f47404b844d1d6ae92241aeee53c182a3c990c68' 
  AND token = 'Ts7/1ocRJWJDesdtQtSxv8xtlQftf5XEID1TB0azwlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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