Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2071e17d1dc9d3ca709941dfb4ee0731512bba0015892b1ed8173c0fa9f5a42c' 
  AND token = 'AoGmP7tQZfmP1DW5HUQro3n0WV4Zj7+a5kos1jepAOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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