Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83832cc63aea54242d2474928f98c7e2b3d3919b82fb1e7c0143b62979240201' 
  AND token = '6pkI9U2ZazH/IPpWMk2cJeFQoomISRuoySSxuWYDEXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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