Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f367c9ec67fb5d1fe4147d35c2dea6dc2fd4257521a3728dde0c6e106a29698f' 
  AND token = 'sSYNEkT6XbCypPJJO1Ts5zKy5rtcRwdP3Ui0VwYwr3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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