Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdffedc364daafba05bb334ff50613d2b37ca511eded837329101637823db20' 
  AND token = '7g4FXJs6/kfg2/Z5tubi/O3gl0NtHbmF3iedd7Yak+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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