Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2376f9a8498c2d0eaa3c56296ce0aca12ee784e76d3c39020d20ab813b502527' 
  AND token = '/U9OJtD8+sTjKXMxeQ07lrDJ0ADHVmui342D2RCBPiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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