Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cd98970615a044dd71b6b2fc3a0dbf8133748ecc1514d2e3d5064cb6fbaa7d' 
  AND token = 'eiCEJYlC8Vhx4IvPOGz+AcyySfDjGf7N+wMo8QXAJf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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