Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca3933fe5a3970f663a0f9d1835ac2d3e2b46e46238d7746a751a392b4e4615' 
  AND token = 'olnSd+fks22Xn7qCZsvzsiTNY50SkYlObQZxdE+g4Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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