Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e311ac0b644cae33bac8fde4141e3ec46f08773bd49cac60c3ce0db21f0aa711' 
  AND token = '9Siqr8fMlUj8pf1sxCNgpDND3Zmtyn8RGFaVeKK3YbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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