Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33403fe01cd3e3ede1d8d86dc936c07dbf55cefc2da643fed77fc0b83f92a7a' 
  AND token = 'mz9NMVSFFNsF3UjSQXoENbikKOj9DwsC2wlhof/hrOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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