Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6410fd7a053fe6500ee86ce1fc64b087a51ed397ab22592b0bc546efe55ceb18' 
  AND token = 'an4qTt5ktGlU4oPaZurg1DOrk23lacQp3q659LRUg4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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