Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c99713494d7e64cad8175e9ef3846ffb4b8a080eb96296ed24316b46c5ccd8' 
  AND token = 'Ej6PBbDZIn+unYytFQolD3mOysKTlVp0f+S1PX6COtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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