Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd66b228567d1f2c4ec8cdbb49e3671bdd4a9fe0cc543a0e46d935bbf350875' 
  AND token = 'sj8NP+4mrFphL6NLGLjL4BoJ2hetrpYdo6qrjRETYsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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