Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3db76edbe4a6d13d49b100fbd6a00ca117c0c1721f79def92f69afc261f1a9' 
  AND token = 'OBvlA+dVK8Zrtq/iIzWp33U0PYKAftDiH7b7OgaBIho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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