Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6366dc204b007d19c07ebc531e35e43b465dcac706da206fa1d49bfec9105ba2' 
  AND token = 'zuLCDwPvXYt28ojeWCmvojD9FAD17jDMA62BB20Wub4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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