Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d72659c44c6b3f86a2d49f88d28f31c403e3e8e80cd9e6eb7e2091d6ff81bd7' 
  AND token = 'D8jFMm/2doRNxQoj6wEJUG2+c72y+s95/B4yCagwfaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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