Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853d250672eb0b885062ab576d876c451b05b11a11a407896c0e2bc1ac551350' 
  AND token = 'g/ywDllXeZRdifo3Y9RHojNUE71YPxN2bKcCqRIrQ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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